1. Department of SurgeryCatharina Hospital Eindhoven Eindhoven Netherlands
2. Department of General and Digestive SurgeryHospital Vall d'Hebrón, Universidad Autónoma de Barcelona Barcelona Spain
3. Department of Primary Health Care SciencesUniversity of Oxford Oxford UK
4. Department of General and Digestive SurgeryHospital Del Mar Barcelona Spain
5. Department of SurgeryMaasstad Ziekenhuis Rotterdam Rotterdam Netherlands
6. Department of General SurgeryErasmus University Medical Centre Rotterdam Netherlands
7. Department of SurgeryMaria Middelares Hospital Ghent Belgium